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Purpose: To obtain basic data for development of a glioblastoma-specific immunotoxin, the expression of variable cell surface receptors on a human glioblastoma xenograft model was evaluated, using NOD/SCID mice. Materials and Methods: We developed a xenograft model in NOD/SCID mice implanted with a human glioblastoma cell line (U-87MG). Immunohistochemical studies were performed on implanted tumor nodules (n=8) using antibodies against CD71, EGFR, IGF-IRα, CXCR4 and IL-4Rα. Results: Expression of IL-4Rα, in implanted tumor nodules, was the highest of the cell surface receptors evaluated in this study. However, the endothelial cells in, and around, the tumor nodules also revealed immunopositivity against IL-4Rα. The immunoreactivity of IL-4R α, and other surface receptors such as CD71, IGF-IRα and EGFR, was prominent in tumor nodules associated with tumor necrosis. Conclusion: IL-4Rα would be a possible target for the development of glioblastoma-specific immunotoxin, although there are limitations due to its endothelial expression. (Cancer Res Treat. 2002;34:52-57)


Purpose: To obtain basic data for development of a glioblastoma-specific immunotoxin, the expression of variable cell surface receptors on a human glioblastoma xenograft model was evaluated, using NOD/SCID mice. Materials and Methods: We developed a xenograft model in NOD/SCID mice implanted with a human glioblastoma cell line (U-87MG). Immunohistochemical studies were performed on implanted tumor nodules (n=8) using antibodies against CD71, EGFR, IGF-IRα, CXCR4 and IL-4Rα. Results: Expression of IL-4Rα, in implanted tumor nodules, was the highest of the cell surface receptors evaluated in this study. However, the endothelial cells in, and around, the tumor nodules also revealed immunopositivity against IL-4Rα. The immunoreactivity of IL-4R α, and other surface receptors such as CD71, IGF-IRα and EGFR, was prominent in tumor nodules associated with tumor necrosis. Conclusion: IL-4Rα would be a possible target for the development of glioblastoma-specific immunotoxin, although there are limitations due to its endothelial expression. (Cancer Res Treat. 2002;34:52-57)


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Glioblastoma, Interleukin-4 receptor, SCID mouse